Cannot call method 'getProxy' of undefined

[no0b]

I started with this example: http://www.sencha.com/blog/using-ext...ur-application
What I want is to change the "on-script" data from grid with another data from my database. For this, I did the following changes:

Ext.define('Elearning.stores.UserStore', {
    extend    : 'Ext.data.Store',
    requires  : ['Elearning.models.UserModel'],
	storeId   : 'usersStore', 


    model     : 'Elearning.models.UserModel',
    proxy: {
        type: 'ajax',
        url : '/data/getUsers.php',
		reader: {
			type: 'json',
			root: 'users'
		}	
    },
	autoLoad: true,
	
    constructor : function() {
        this.callParent(arguments);
    }
});

I also edited the file UsersGridPanel.js

Ext.define('Elearning.views.UsersGridPanel', {
    extend   : 'Ext.grid.Panel',
    alias    : 'widget.UsersGridPanel',
    requires : ['Elearning.stores.UserStore'],


    initComponent : function() {
        this.store   = Elearning.stores.UserStore;
        this.columns = this.buildColumns();
        this.callParent();
    },
    buildColumns : function() {
        return [
            {
                header    : 'First Name',
                dataIndex : 'nume',
                width     : 70
            },
            {
                header    : 'Last Name',
                dataIndex : 'prenume',
                width     : 70
            },
            {
                header    : 'Email',
                dataIndex : 'email',
                width     : 70
            },
            {
                header    : 'Username',
                dataIndex : 'username',
                width     : 70
            }
        ];
    }
});

Unfortunately, I got an error (on Chrome console) at the red line described below with the error message Cannot call method 'getProxy' of undefined

    initComponent : function() {
        this.store   = Elearning.stores.UserStore;
        this.columns = this.buildColumns();
        this.callParent();
    },

Thanks in advance.

[redraid]

    initComponent : function() {
        this.store   = Ext.create('Elearning.stores.UserStore');
// or:
//        this.store   = 'Elearning.stores.UserStore';
        this.columns = this.buildColumns();
        this.callParent(arguments);
    }, 

[no0b]

It works and..hard to be a ...noob!

Thanks!

    initComponent : function() {
        this.store   = Ext.create('Elearning.stores.UserStore');
// or:
//        this.store   = 'Elearning.stores.UserStore';
        this.columns = this.buildColumns();
        this.callParent(arguments);
    },